Java 将mouseListener、JRadioButton和paintComponent集成到JPanel中选择并创建形状中

不熟悉MouseListener和paintComponent工具，但我必须使用它们来创建GUI，该GUI能够在每个鼠标单击位置创建形状（首先选择一个），而无需使用小程序。第一次在这里，不知道如何正确地张贴语法以及。对不起

Create.java

public class Create extends JFrame implements ActionListener{
    static int x, y;
    static int sSelection;
    JPanel blankSlate, shapeChoice, topMenu;
    JMenuBar scBar, utilityBar;
    JMenu fileMenu, shapeMenu;
    JMenuItem menuiSave, menuiLoad, menuiNew;
    JRadioButtonMenuItem triA, rectA, circle;

    public Create(){
        //container block
        Container container=getContentPane();
        container.setLayout(new BorderLayout());

        //creation block
        topMenu=new JPanel();
        topMenu.setLayout(new GridLayout(1,3));
        blankSlate=new JPanel();
        blankSlate.setLayout(new BorderLayout());
        shapeChoice=new JPanel();
        shapeChoice.setLayout(new GridLayout(1,3));

        //utilities block
        utilityBar=new JMenuBar();
        setJMenuBar(utilityBar);
        fileMenu=new JMenu("File");
        menuiSave=new JMenuItem("Save");
        menuiLoad=new JMenuItem("Load");
        menuiNew=new JMenuItem("New");
        fileMenu.add(menuiNew);
        fileMenu.add(menuiSave);
        fileMenu.add(menuiLoad);
        utilityBar.add(fileMenu);

        //adding bars to sections block
        topMenu.add(utilityBar);

        //Blank Slate block
        //need to add mouselistener and paintComponent according to selection of shapes
        AL a1=new AL();

        //shape choice block
        scBar=new JMenuBar();
        setJMenuBar(scBar);
        shapeMenu=new JMenu("Shapes");
        triA=new JRadioButtonMenuItem("Triangle");
        circle=new JRadioButtonMenuItem("Circle");
        rectA=new JRadioButtonMenuItem("Rectangle");
        shapeMenu.add(triA);
        shapeMenu.add(circle);
        shapeMenu.add(rectA);
        ButtonGroup gr= new ButtonGroup();
        gr.add(triA);
        gr.add(circle);
        gr.add(rectA);
        triA.addActionListener(this);
        circle.addActionListener(this);
        rectA.addActionListener(this);
        scBar.add(shapeMenu);

        //adding bars to sections block
        shapeChoice.add(scBar);



        //adding sections to container
        container.add(BorderLayout.NORTH, topMenu);
        container.add(BorderLayout.CENTER,blankSlate);
        container.add(BorderLayout.SOUTH,shapeChoice);
    }

    public void formula()
    {
        if(sSelection==1){
            ShapeRect r1=new ShapeRect();}
        else if(sSelection ==2){}
        else if(sSelection==3){}
    }

及

其他类

        class AL extends MouseAdapter{
            public void mouseClicked(MouseEvent e){
                x=e.getX();
                y=e.getY();
                drawing(x, y);
            }
        }
    }

Test.java

public class Test extends JFrame{       
    public static void main(String[]args){

        Create fr = new Create ();
        fr.setSize(500, 500);
        fr.setDefaultCloseOperation(EXIT_ON_CLOSE);
        fr.setLocationRelativeTo(null);
        fr.setTitle("Create");
        fr.setVisible(true);
    }
}

竖立

public class ShapeRect extends Shape{
    static int x, y;
    public void paintComponent(Graphics g) {
        paintComponent(g);
        g.setColor(Color.BLACK);
        g.fillRect(x, y, 20, 20);
    }
}

public class ShapeRect extends Shape{
    static int x, y;
    public void paintComponent(Graphics g) {
        paintComponent(g);
        g.setColor(Color.BLACK);
        g.fillRect(x, y, 20, 20);
    }
}